Now Mr. Potato Head is at it again - causing a commotion in the grocery store as he goes about shopping for one of his wife's favorite foods in the latest installment of the Mr. and Mrs. Potato Head advertising saga from Energy BBDO Chicago for the iconic Lay's potato chip brand, a unit of the beverage and snack behemoth PepsiCo . It's not everyday that a Mr. Potato Head is seen roaming the aisles in a grocery store trying - hopelessly of course - to mask his true identity with a pair of sunglasses.